Pratical skills- Chemistry
- Created by: saralycett
- Created on: 24-05-17 11:31
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- Practical Techniques
- REFLUX
- Liebig condenser
- Vapours are recycled back into the reaction mixture
- Purification of SOLIDS
- 1.Hot solvent added to dissolve solid to form saturated solution
- 2. Solution is let to cool so the solid crystallises
- 3. Crystals are filtered under reduced pressure
- 4. Washed with ice cold water
- 3. Crystals are filtered under reduced pressure
- Temperature of the solvent is important
- 2. Solution is let to cool so the solid crystallises
- 1.Hot solvent added to dissolve solid to form saturated solution
- Purification of LIQUIDS
- If product is insoluble in water then adding water can remove soluble impurities
- Impurities then removed by separating filters
- Has to be dried using anhydrous salts to remove any water that may remain
- If product is insoluble in water then adding water can remove soluble impurities
- DISTILLATION
- Separates substance in increasing boiling points
- FILTERING
- Buchner funnel: attached to a vacuum line flask
- The vacuum line causes a suction which causes the liquid to pass
- Buchner funnel: attached to a vacuum line flask
- PURITY BASED ON MP AND BP
- Impure solid have a lower MP and higher BP
- Those that are pure have a small range of MP and BP
- REFLUX
- DISTILLATION
- Separates substance in increasing boiling points
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